2-in-1 Carbon Monoxide and Natural Gas Smart Alarm
120 Volt AC Hardwired Alarm
Can be used to replace the USI-7390 alarm, uses same connector plug.
Dual Technology Offers Double Protection
9 Volt Eveready Alkaline Battery Backup Included
Loud 85 db Alarm
Self Diagnostic Feature
Product End of Service Life Warning
Quick Draw Battery Drawer
3 LED's Indicate: Power, CO & Gas
Interconnectable up to 24 Compatible Devices
Quick Find Alarm Origination/Locator
Tamper Resistant Locking Feature for Alarm & Battery
Battery Activation Pull Tab
Bracket Mounts to any Standard Wiring Junction Box
Ideal for Homes, Apartments and Mobile Homes
Conforms to UL Std. UL 2034 and UL 1484
California State Fire Marshal Approved
7 Year Limited Warranty
The USI Electric MCN108 Hardwired Carbon Monoxide and Natural Gas Smart Alarm is a 2-in-1 device that provides double the protection with a single installation. This dual-sensing alarm protects against two deadly household threats: carbon monoxide and natural gas (or methane). Perfect for new or replacement installations, the 120-volt AC/DC hardwired alarm is suitable for houses, apartments and mobile homes. Auto sensitivity calibration provides superior nuisance alarm protection and creates consistency in alarm sensitivity. This alarm has additional automatic features including a self-diagnostics check to ensure proper operation, a sensitivity adjustment for changes in temperature or humidity and an end-of-service life warning that sounds when it's time to replace the battery. The 9-volt alkaline battery (included) continues protection in the event of a power outage.
This alarm features a quick activation pull-tab and a front-loading battery drawer for replacement without removing the alarm from the bracket. Mount the bracket to any standard wiring junction box and use the large mounting base to cover imperfections in drywall. The plastic dust cover protects the alarm from debris and (2) tamper-resistant locks prevent unwanted alarm or battery removal. For maximum protection, install an alarm inside every bedroom, outside every sleeping area and on all levels of the dwelling. The USI Electric MCN108 Hardwired Carbon Monoxide and Natural Gas Smart Alarm comes with a 7 year limited warranty.
Warranty: 7 year Limited Warranty
Alarm Power Source: 120 volt hardwired & 9 volt battery backup
Alarm Sensor Type: Metal Oxide Carbon Monoxide Sensor
Manufacturing Credits: ISO 9001 certified factory, UL listed & CSFM listed
Packaging: Easy Open Box Packaging
Product Dimensions (W x H x D): 5.75 x 5.75 x 1.75 in.
Q: WHAT LEVELS (PPM) OF CARBON MONOXIDE CAUSE AN ALARM?
A: Carbon monoxide alarms are designed to alarm before the average healthy adult feels symptoms. Since you cannot see or smell CO, never assume it's not present. Underwriters Laboratories Inc. Standard UL2034 requires residential CO alarms to sound when exposure times and exposure levels of CO in the chart below. CO alarm levels are measured in parts per million (ppm) of CO over time (in minutes). The UL2034 Required Alarm Points are:
If the Alarm is exposed to 400 ppm of CO, it must alarm between 4 and 15 minutes.
If the Alarm is exposed to 150 ppm of CO, it must alarm between 10 and 50 minutes.
If the Alarm is exposed to 70 ppm of CO, it must alarm between 60 and 240 minutes.
Q: IS CARBON MONOXIDE HEAVIER THAN AIR?
A: Carbon monoxide is not heavier than air. A carbon monoxide alarm should be installed in a location where the alarm will stay clean, and out of the way of children or pets. Refer to the user's manual for specific installation requirements.
Q: WHERE SHOULD I INSTALL MY CARBON MONOXIDE ALARMS?
A: It is very important to install a carbon monoxide alarm outside each separate sleeping area, and for maximum protection, install one in every bedroom. Many states now require installation of a carbon monoxide alarm inside each bedroom. For added protection, placement of an additional carbon monoxide alarm at least 15-20 feet away from the furnace or fuel burning heat sources is recommended. Install carbon monoxide alarms a minimum of 10 feet from sources of humidity like bathrooms and showers. In multiple-story dwellings, install one carbon monoxide alarm on every level. If you have a basement, install a carbon monoxide alarm at the top of the basement stairs, and in each separate sleeping area.
Q: WHAT AREAS SHOULD I AVOID INSTALLATION OF A CARBON MONOXIDE ALARM?
A: Do not install carbon monoxide alarms in garages, kitchens, furnace rooms, or in any extremely dusty, dirty, humid, or greasy areas. Do not install alarms in direct sunlight, or areas subjected to temperature extremes. These areas include unconditioned crawl spaces, unfinished attics, un-insulated or poorly insulated ceilings, and porches. Carbon monoxide alarms should not be installed in outlets covered by curtains, heavy furniture or other obstructions. Do not install in turbulent air-near ceiling fans, heat vents, air conditioners, fresh air returns, or open windows. Blowing air may prevent carbon monoxide from reaching the CO sensors.
USI Electric Hardwired 2-in-1 CO and Natural Gas Alarm, Battery Backup (MCN108) Video
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USI Electric Hardwired 2-in-1 CO and Natural Gas Alarm, Battery Backup (MCN108) Reviews
- Reviewed: 02/27/2022 by David L
USI Electric Carbon Monoxide and Natural Gas
This alarm replaced my previous hard-wired USI Carbon Monoxide alarm. It was reasonably priced and delivered to my home on time. It was very easy to install as the electrical connector was the same as my previous model. It also detects Natural Gas as an added bonus. Overall, I am very pleased with this purchase and would recommend it.
- Reviewed: 12/31/2021 by Alberto N
Good experience ordering on website. Delivery of product and product itself.
- Reviewed: 11/17/2021 by Kris J
Product works great
- Reviewed: 11/09/2021 by Ross K
I was pleasantly surprised this company was still producing after there product has been in homes.for 10 years.
Thanks for providing me a 1 for 1 swap option you saved me a lot of time.
- Reviewed: 10/21/2021 by James D
USI Product and Service
Typical quality product from USI, with a good selection of options and ease of installation. I continue to purchase from Universal because of their excellent customer service, very prompt order fulfillment and shipping.
- Reviewed: 04/12/2021 by Michael A
So I was trying to exactly match the CO2/gas alarm we had and this one was the exact match. The alarm arrived promptly and works great!
- Reviewed: 11/12/2020 by Karl Gontkof
MCN108 2-in-1 CO2 & Natural Gas Alarm
I have used the USI 2-in-1 CO2 and Natural Gas models for over 15 years. The product works well, however it doesn't always live a 7 yr life
- Reviewed: 07/31/2020 by Debra Stec
Love them. They work really good.
- Reviewed: 07/02/2020 by James Morehouse
The alarms in the house I purchased at the end 2018 had these alarms, and I noticed they were already three years out of date, and were still working. I decided to replace them with these from the same company, as they seem to be pretty reliable.
- Reviewed: 01/20/2020 by Ralph Stamm
Replacing existing detector was a snap
This new detector was replacing an existing one, which was at its end of life. The installation was very easy and quick. I will definitely be purchasing any detectors I need from USI in the future.
- Reviewed: 01/06/2020 by Jacob Eddy
Work as advertised and shipped quickly
- Reviewed: 07/01/2019 by Stephen Signore
Perfect product, perfect fit and quick shipment. Highly recommend.
- Reviewed: 07/01/2019 by Robert Corwin
Had no problem with the setup plugged it in at work fine and continues to work fine
- Reviewed: 02/27/2019 by Roberta Leevers
These units worked perfectly and were easy to install.
- Reviewed: 02/22/2019 by Kris Jones
CO2 and Nat Gas alarm
This is a very good product. My previous alarm lasted 10 years and this is the newer version of this. Easy to plug in and works great so far.
- Reviewed: 02/11/2019 by barry saxe
The product is excellent and solved a tough problem for us
- Reviewed: 01/21/2019 by vicki dorsey
Very easy in replacing our older ones...
- Reviewed: 11/19/2018 by Jeanne Navratil
Order placed and I had them installed within a week. These replaced two old ones that were no longer working. Less than 10 minutes to install. Highly recommend Universal Security Store.
- Reviewed: 11/06/2018 by steve sullivan
Had to replace older models hope these last longer.
- Reviewed: 10/24/2018 by M Meek
I ordered this model to replace an existing CO detector. Easy removal of two screws made this a simple change out. The existing harness plug worked as advertised. 5 minutes start to finish install. Great
- Reviewed: 10/01/2018 by A.R.
I recently purchased this item directly from USI.
Product arrived as expected and in the condition described on their website.
Excellent Value..... Thanks
- Reviewed: 08/28/2018 by Lawrence Kleinberg
Installation and performance as advertised
- Reviewed: 08/17/2018 by Theresa Black
Purchased replacement alarms. Easy to install. Customer service from Michele was amazing!
- Reviewed: 08/17/2018 by Theresa Black
Purchase md replacement alarms. Easy to install. Customer service from Michele was amazing!
- Reviewed: 06/13/2018 by Cataldo Minutillo
Warranty specify 7year. Never lasts more tan five years.
Customer Service Response:
We're sorry to hear that Cataldo. The MCN108 does include a 7 year limited warranty. If your combo alarm didn't make it the seven year mark, we'd be happy to speak with you @ 847-701-3013. Let's get the situation resolved and keep you safe!
- Reviewed: 06/06/2018 by Victoria Cavaliere
Ordered a 2-in-1 Carbon Monoxide and natural gas alarm from USI ELECTRIC. Placed order on line and received it promptly. This is the second time I have placed an order with USI and I'm very satisfied with their service. Would highly recommend them to friends.
- Reviewed: 06/04/2018 by Victoria Cavaliere
Ordered a 2-in1 carbon Monoxide and natural gas alarm from USI ELECTRIC. Placed order on line and received it promptly. This is the second time I have placed an order with USI and I'm very satisfied with their service. Would highly recommend them to friends.
- Reviewed: 04/11/2018 by David Springer
Great Product - excellent service
I ordered replacement units directly from USI as the older ones, while still functional, were dated 2003. I called to place order, was treated well, and the products were well priced and shipped timely and free. I recommend this company!
- Reviewed: 04/07/2018 by Elton Davis
Easy to install, reliable product
- Reviewed: 03/16/2018 by William Hearn
Easy install MCN108
Looked for a replacement for a builder installed wired system and wanted the same brand. USI customer service rep recommended the MCN108. Item worked perfectly and very easy install. Highly recommend
- Reviewed: 03/06/2018 by Roger Close
Excellent Customer Service
I received exceptional assistance and service from Michele Metcalf in Customer Service and Jenna McLaughlin with the Universal Security Store. Gas detectors seem to be working well!
- Reviewed: 02/26/2018 by Shahla Didehbani
They work great!
- Reviewed: 02/15/2018 by james weiner
Quick, good product
- Reviewed: 02/06/2018 by Charlene Mason
Does Not Fit Well
We purchased this model MCN108 because we were told it was the correct replacement for an older model CD-9385. However, even with changing to the new universal bracket, we found that the alarm does not fit as snugly against the ceiling as the old model did.
- Reviewed: 01/18/2018 by susan mclaughlan
- Reviewed: 01/13/2018 by Thomas Dyszkiewicz
Easy install, web site was easy to use and delivery was prompt
- Reviewed: 01/12/2018 by Thomas Dyszkiewicz
Easy install, web site was easy to use and delivery was prompt
- Reviewed: 12/03/2017 by Dennis Clairmont
Easy to install
- Reviewed: 11/20/2017 by Jean Scavone
Easy to install. It is great!
- Reviewed: 11/13/2017 by terri huber
Our old alarms were 8 years old when they went out. I called customer service and spoke to Michelle M. What a great CS person she called me back and sent an email with the replacement number. When I received it, what a perfect fit. Thanks Michelle M
- Reviewed: 11/06/2017 by Melissa Wilder
We replaced all Carbon Monoxide and Natural Gas Smart Alarms with Battery Backup MCN108. Product was shipped in a timely manner, questions to customer service was extremely responsive and the product was easy to replace upon installation
- Reviewed: 10/30/2017 by Lawrence Long
no issues....simple replacement. thanks, Larry.
- Reviewed: 08/17/2017 by Arne Hawkins
We built a new home and the builder installed Universal products. After 7 years both stopped working so I got on Amazon and ordered two replacements. Not long after, one stopped working and when I checked the manufacturing date, it was 5 years old already. Order direct from Universal and avoid additional costs!
- Reviewed: 05/29/2017 by Troy Smith
Quick delivery and easy install.
- Reviewed: 05/08/2017 by David Provan
Easy to install and working well.
- Reviewed: 11/11/2016 by Ron Brandon
I like the addition of a back up battery.
- Reviewed: 10/05/2016 by Carole Schadoff
Great replacement for my Model CD-9485. Perfect fit. Very pleased with customer service.
- Reviewed: 07/08/2016 by Gail Carlson
Was a perfect fit for the older model that had to be replaced.
- Reviewed: 06/08/2016 by John Milcetic
this product was a good value and was perfectly suited to my needs. Easy installation and work perfectly in tests.
- Reviewed: 05/05/2016 by ben schlesinger
- Reviewed: 04/19/2016 by David
Combo CO & Nat Gas Alarm
Needed replacement CO detectors for existing USI CO monitors 8 years old. Nice to see natural gas detection functionality is now integrated into a single unit.
- Reviewed: 03/30/2016 by Marina Kelly
- Reviewed: 03/29/2016 by Wallace Zawierucha
Perfect! Fit the existing mounting bracket.
So far so good!
- Reviewed: 02/16/2016 by Don Schelling
Good product. I order four at a time as I am in real estate and give them to my clients. They really appreciate it. Thank you.
- Reviewed: 01/05/2016 by Eugene Foster
- Reviewed: 12/08/2015 by Tammy Browning
I can not find these in any local store and so I am glad I have found a store I can rely on to replace my carbon monoxide detectors. A quick fix and lasts a long time.
- Reviewed: 10/02/2015 by Charles Cozewith
USI Electric Hardwired 2-in-1 Carbon Monoxide and Natural Gas Smart Alarm
This alarm was purchased to replace a similar alarm that no longer worked. It installed easily and there were no problems with the set up procedure which was well described in the product info.
- Reviewed: 06/23/2015 by Glen Inselman
THEY WERE VERY KNOWLEDGABLE, QUICK, EFFICIENT AND COURTEOUS
- Reviewed: 06/15/2015 by Pamela Jackson
Excellent service & product
After communicating on the online chat, I was advised the type product I needed. It arrived in a timely manner & was a perfect solution to my problem.
- Reviewed: 06/15/2015 by Gary Bailin
This item was installed with great ease due to the compatible nature of the product. The CO detector is more current compared to the old, expired version obtained 7.5 years ago.
We also ordered the smoke detectors and look forward to ensuring the safety of our family. Shipment was in a timely fashion.
- Reviewed: 05/12/2015 by Debby Hatchett
Great company to work with. They kept me updated on when product would be delivered. Product worked perfect.
- Reviewed: 05/05/2015 by Michael Schaewe
Carbon monoxide detector
I replaced my CO meter with this new device. It shipped quickly, was well-packaged and was incredibly easy to install.
In all, a great transaction and nice device.
- Reviewed: 03/16/2015 by karen patterson
Came quickly,easy to hook up
- Reviewed: 02/26/2015 by steve kawakami
The product fit perfectly to replace the previous model that it replaced.
- Reviewed: 01/06/2015 by Robert Pettinato
Looks and works great!!
Works great, I have this throughout the house smoke detectors and carbon monoxide. Unfortunately my tenant took this one with them when they left or broke it ect, this was the perfect replacement..